/Engine/Source/Runtime/Engine/Classes/Engine/BlueprintGeneratedClass.h
Finds the first code location (Function+CodeOffset) associated with the source pin within the given range, or INDEX_NONE if there isn't one.
int32 FindCodeLocationFromSourcePin ( [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) const * SourcePin, [UFunction](API\Runtime\CoreUObject\UObject\UFunction) * InFunction, [FInt32Range](API\Runtime\Core\Math\FInt32Range) InRange ) const